. >>> and first president obama and other world leaders take off for south africa to honor nelson mandela. >>> this is a fox news alert, government sources confirm justice department prosecutors filed charges against a russian spy ring. it involves a group of current and former russian diplomats who ran a nine year scheme that stole $1.5 million from medicaid. they were also apparently engaged in espionage and being investigated for other reasons than just the medicaid fraud. about 50 people were charged. of those, 11 are still in the u.s. and have immunity so they can't be arrested. but the state department can send them home. topping world headlines now, dozens of world leaders, past and present, are joining with tens of thousands of others making their way to south africa to pay their final respects to the late nelson mandela. greg tal cot is in johannesberg with more. >> the world is coming to south africa to honor nelson mandela. they are testimony to the reach of a man and his message. president obama, first lady michelle and the bushes and clintons are wheels up. also well over 70